U.S. wholesale inflation jumped significantly last month, driven largely by soaring energy costs following the conflict in Iran. The Labor Department reported that the producer price index (PPI), which tracks inflation before it reaches consumers, rose 4% from March 2025. This marks the biggest year-over-year gain in the PPI in over three years.The sharp jump in commodity prices complicates the already delicate work of inflation managers at the Federal Reserve. The energy sector was particularly volatile, with energy prices surging 8.5% from February. While core producer prices rose a modest 3.8% year-over-year (excluding volatile food and energy), the overall acceleration in wholesale costs presents a major policy dilemma for the...